Boiling heat transfer on machined porous surfaces with structural optimization

Boiling heat transfer on porous surfaces needs further research for augment ation. Analysis of the microfilm evaporation and two-phase flow inside the microstructure was used to develop new microscale heat transfer model for b oiling heat transfer on porous surfaces. Simulation results were used to st udy in detail the effects of fluid parameter and microstructure dimensions on the heat transfer performance during the bubble formation period. For bo iling on porous surfaces with such working fluids as R11, R22, R134a and wa ter, optimum microstructure dimensions were determined for the given condit ions. The calculated results fit previous experimental data well. An experi mental rig was developed to measure the pool boiling heat transfer to test the predictions of the optimization. The experimental data verified the opt imization results. (C) 2000 Elsevier Science Ltd. All rights reserved.